CN116410717A - Profile control agent and its preparation method and application - Google Patents
Profile control agent and its preparation method and application Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 69
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention relates to a profile control agent, a preparation method and application thereof, wherein the profile control agent comprises the following components in parts by weight based on 100 parts of the total weight of the profile control agent: 0.15-0.25 part of temperature-resistant salt-resistant polymer, 0.1-0.125 part of cross-linking agent containing hydroxyl phenol, 0.05-0.075 part of stabilizer and 100 parts of water. The invention solves the technical problems of easy degradation of the polymer chain, short gel forming time and poor gel stability of the conventional polymer gel profile control agent in the high-temperature (110-130 ℃) profile control operation, can realize deep liquid flow diversion, and achieves the purpose of plugging the high-permeability layer of the high-mineralization oil reservoir.
Description
Technical Field
The invention relates to the technical field of profile control operation, in particular to a profile control agent, a preparation method and application thereof.
Background
The existing high-temperature deep liquid flow diversion and profile control agents of the oil field are various, and the relatively mature chemical system at present mainly comprises four major categories of crosslinked polymer gel, high-strength elastic slow-expansion particles, flexible dispersed microgel particles and inorganic gel coating. The crosslinked polymer gel belongs to a continuous phase plugging agent and has good plugging capability, and has the advantages of easy injection, controllable gel forming time and good plugging effect, but the conventional crosslinked polymer gel has certain limitations on stability and compatibility with formation water under the conditions of high-temperature high-salt oil reservoirs, has poor divalent ion resistance and is difficult to adapt to special oil reservoir conditions such as high temperature, high-salt oil reservoirs, deep wells, ultra-deep wells and the like. The high-strength elastic slow-expansion particles belong to a disperse phase plugging agent, solve the problems that the conventional bulk expansion particles are quick in water absorption expansion, easy to crush and difficult to enter the deep part of a stratum, have high plugging strength, and are only suitable for plugging large-level dominant channels and cracks. The flexible dispersed microgel particles belong to a dispersed phase plugging agent, and have the characteristics of water swelling, no change when meeting oil, no oil way blockage when plugging a water path, elastic deformation, reversible water swelling-dehydration-re-water absorption process, stable structure, shearing resistance, simple injection process and the like, but the plugging strength is weaker, and the subsequent water flooding effect is limited. The inorganic gel coating gradually narrows the water flow dominant channel, increases the flow resistance, realizes 'blocking but not dead', can realize deep placement, can realize the profile control and flooding steering of different degrees and depths by multi-section plug injection, has low cost, no toxicity, environmental protection, simple construction and small field application scale. By comprehensively considering the factors, the long-term stability of the profile control agent at high temperature can be improved, and the high-temperature deep liquid flow diversion system is a cross-linked polymer gel system.
CN106634909a discloses a deep liquid flow steering profile control agent for oil reservoirs, a preparation method and application thereof. The disclosed oil reservoir deep liquid flow steering profile control agent comprises, by total weight, 100 parts of raw material components of 0.4-0.6 part of salt-resistant polymer, 0.2-0.4 part of cross-linking agent and the balance of water. Salt-resistant polymer in hypersalinity in preparation method of oil reservoir deep liquid flow steering profile control agentThe dissolution speed in the brine is high and is less than 90 minutes; the gel viscosity of the prepared oil reservoir deep liquid flow steering profile control agent after gel formation reaches 1.0x10 4 The gelatinization time is controlled to be 16-40h above mPa.s; has better heat stability, high temperature resistance and salt resistance, the high-permeability layer is effectively blocked, and the blocking efficiency is high; the method can be suitable for deep profile control and flooding of high-temperature and high-mineralization oil reservoirs, improves the water flooding development effect and improves the water flooding recovery ratio.
CN106147738A discloses a deep profile control agent for oil reservoirs and a preparation method thereof. The disclosed oil reservoir deep profile control agent consists of the following raw materials in parts by weight: viscoelastic polymer particles 0.15-0.45, chemical cross-linking agent capable of reacting with amido or carboxylic acid radical 0.2-0.4, water 99.15-99.65 with mineralization degree 0-30000 mg/L. The disclosed profile control agent is a gel system with high viscoelasticity and high strength, which is produced by chemical crosslinking reaction of the viscoelasticity polymer particles and a chemical crosslinking agent at the temperature of an oil reservoir after the viscoelasticity polymer particles and the chemical crosslinking agent are mixed and injected into the oil reservoir. Compared with the existing deep profile control system, the system disclosed by the system not only has the plugging performance of viscoelastic particles on pore throats when passing through a stratum, but also has the characteristics of high viscosity and high viscoelasticity of a crosslinked polymer gel system, and the profile control agent not only has better profile control effect on oil reservoirs with higher heterogeneous degree, but also has the function of improving the oil displacement efficiency.
With the development of oil fields, more and more high-temperature high-salt oil reservoirs enter a large-scale development stage, the oil reservoir temperature of the high-temperature high-salt oil reservoirs is generally 110 ℃, and the mineralization degree is more than 5 multiplied by 10 4 mg/L, the profile control system in the prior art is difficult to adapt to the development environment of high temperature and high salt. The polymer is easy to degrade at high temperature, so that the structure of the profile control system is damaged, and the finally formed gel has lower strength. The ultrahigh mineralization can dehydrate, shrink volume and damage structure of the gel in the stratum, resulting in poor stability of the gel; in addition, the high-temperature oil reservoir is generally a deep well or ultra-deep well oil reservoir, in order to prevent the plugging agent from forming gel in a well shaft or a near-well zone, the gel needs longer gel forming time, and the gel forming time of most gels is reduced at high temperature, so that the injection requirement is difficult to meet.
In summary, it is important to develop a profile control agent which has controllable gel forming time, high gel strength, good aging resistance and simple preparation and is suitable for high-temperature high-salt oil reservoir conditions.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a profile control agent, a preparation method and application thereof, wherein the profile control agent is suitable for high-temperature high-salt oil reservoir conditions, and has the advantages of controllable gel forming time, high gel strength, good ageing resistance, simple preparation, environmental protection, less consumption and low cost.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a profile control agent, which comprises the following components in parts by weight based on 100 parts by weight of the total weight of the profile control agent:
according to the invention, the profile control agent has the advantages of controllable gel forming time, high gel strength and good ageing resistance on the premise of low contents of the temperature-resistant and salt-resistant polymer, the cross-linking agent and the stabilizer, and can be used for profile control operation of a high-temperature and high-salt oil reservoir.
In the present invention, the weight part of the temperature-resistant and salt-resistant polymer is 0.15 to 0.25 part, for example, 0.16 part, 0.17 part, 0.18 part, 0.19 part, 0.20 part, 0.21 part, 0.22 part, 0.23 part, 0.24 part, etc.
The weight part of the crosslinking agent containing the hydroxyphenol is 0.1 to 0.125 part, for example, 0.105 part, 0.110 part, 0.115 part, 0.120 part, etc.
The weight parts of the stabilizer are 0.05-0.075 parts, e.g., 0.055 parts, 0.060 parts, 0.065 parts, 0.070 parts, etc.
Preferably, the temperature resistant and salt resistant polymer has a number average molecular weight of > 1000 ten thousand g/mol, e.g. 1200 ten thousand g/mol, 1400 ten thousand g/mol, 1600 ten thousand g/mol, etc.
In the invention, the temperature-resistant and salt-resistant polymer has high gel strength and good system stability of the profile control agent formed in a higher range of number average molecular weight.
Preferably, the temperature-resistant and salt-resistant polymer comprises polyacrylamide and/or a copolymer thereof.
Preferably, the mineralization degree of the water is 5×10 4 -1.0×10 5 mg/L, e.g. 5.5X10 4 mg/L、6×10 4 mg/L、6.5×10 4 mg/L、7×10 4 mg/L、7.5×10 4 mg/L、8×10 4 mg/L、8.5×10 4 mg/L、9×10 4 mg/L、9.5×10 4 mg/L, etc.
In the present invention, the mineralization degree of the water is 5×10 4 -1.0×10 5 mg/L, the environment of the high-salt oil reservoir can be simulated, and the performance of the profile control agent in the high-salt environment can still meet the production requirement.
Preferably, the structure of the hydroxyphenyl-containing cross-linking agent is as follows:
the reason why the above-mentioned crosslinking agent containing a hydroxyphenol is preferable in the present invention is that the crosslinking agent can be compounded with a high polymer in a small amount, and the gel forming time in a high-temperature and high-salt environment is long and the stability is strong.
Preferably, the preparation raw materials of the cross-linking agent containing the hydroxyl phenol comprise: a first reactant, a second reactant, an emulsifier, and a catalyst;
the first reactant comprises any one or a combination of at least two of phenyl acetate, phenyl formate, or phenyl benzoate, wherein typical but non-limiting combinations include: a combination of phenyl acetate and phenyl formate, a combination of phenyl formate and phenyl benzoate, a combination of phenyl acetate, phenyl formate and phenyl benzoate, and the like, with phenyl acetate being further preferred;
the second reactant comprises any one or a combination of at least two of hexamethylenetetramine, ethylenediamine or polyoxymethylene, wherein typical but non-limiting combinations include: a combination of hexamethylenetetramine and ethylenediamine, a combination of ethylenediamine and polyoxymethylene, a combination of hexamethylenetetramine, ethylenediamine and polyoxymethylene, and the like.
Preferably, the emulsifier comprises any one or a combination of at least two of OP-10, OP-15 or SPAN80, wherein typical but non-limiting combinations include: combinations of OP-10 and OP-15, combinations of OP-15 and SPAN80, combinations of OP-10, OP-15 and SPAN80, and the like.
Preferably, the catalyst comprises any one or a combination of at least two of ammonium chloride, ammonium sulfate or ammonium bisulfate, wherein typical but non-limiting combinations comprise: a combination of ammonium chloride and ammonium sulfate, a combination of ammonium sulfate and ammonium bisulfate, a combination of ammonium chloride, ammonium sulfate and ammonium bisulfate, and the like.
Preferably, the stabilizer comprises any one or a combination of at least two of m-xylylenediamine, diethylenetriamine or m-phenylenediamine, wherein typical but non-limiting combinations include: the combination of m-xylylenediamine and diethylenetriamine, the combination of diethylenetriamine and m-phenylenediamine, the combination of m-xylylenediamine, diethylenetriamine and m-phenylenediamine, and the like are more preferable, and m-xylylenediamine is further preferable.
In a second aspect, the present invention provides a method for preparing the profile control agent according to the first aspect, the method comprising the following steps:
and dissolving the temperature-resistant and salt-resistant polymer in water, mixing a crosslinking agent containing hydroxyl phenol, a stabilizer and water, and finally mixing the two solutions to perform a crosslinking reaction to obtain the profile control agent.
The method is simple and easy to operate, the time is spent within 60 minutes, and the method is convenient to use.
Preferably, the preparation method of the cross-linking agent containing the hydroxyl phenol comprises the following steps:
the first reactant and the second reactant are subjected to condensation reaction under the action of a catalyst and an emulsifier to obtain the cross-linking agent;
the first reactant comprises any one or a combination of at least two of phenyl acetate, phenyl formate or phenyl benzoate, and further preferably phenyl acetate;
the second reactant includes any one or a combination of at least two of hexamethylenetetramine, ethylenediamine or polyoxymethylene, and more preferably hexamethylenetetramine.
The conventional phenolic aldehyde cross-linking agent is not environment-friendly due to the stimulus of taste, and the preparation method of the cross-linking agent is different from the method that phenolic aldehyde is used as a raw material, the raw material is nontoxic and environment-friendly, the formed cross-linking agent has a benzene ring structure, and the formed cross-linking agent is matched with a temperature-resistant and salt-resistant polymer, so that the obtained profile control agent is more suitable for operation in high-temperature and high-salt oil reservoir conditions.
Preferably, the temperature of the condensation reaction is 90-95 ℃, e.g., 91 ℃, 92 ℃, 93 ℃, 94 ℃, etc.
As a preferable technical scheme, the preparation method of the cross-linking agent containing the hydroxyl phenol comprises the following steps:
and (3) carrying out condensation reaction on phenyl acetate and hexamethylenetetramine under the action of a catalyst and an emulsifier at the temperature of 90-95 ℃ to obtain the hydroxyl phenol-containing cross-linking agent.
In a third aspect, the present invention provides an application of the profile control agent according to the first aspect in profile control operation;
the temperature of the profile control operation is 110-130 ℃, such as 115 ℃, 120 ℃, 125 ℃ and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention solves the technical problems of easy degradation of the polymer chain, short gel forming time and poor gel stability of the conventional polymer gel profile control agent in the high-temperature (110-130 ℃) profile control operation, can realize deep liquid flow diversion, and achieves the purpose of plugging the high-permeability layer of the high-mineralization oil reservoir.
(2) The profile control agent is suitable for high-temperature high-salt oil reservoir conditions, has the advantages of controllable gel forming time, high gel strength, good ageing resistance, simple and environment-friendly preparation, less consumption and low cost (accounting cost is about 110 yuan/square), and has wider application foundation and requirements.
(3) The profile control agent is injected into a 19-bit test block of a high 76-fault-block deep profile control test 7 of an Jidong oilfield, injected into 12.28 square meters and added with 16000 tons of accumulated oil.
Drawings
Fig. 1 is a schematic structural diagram of a parallel core displacement physical model according to the present invention.
Detailed Description
To facilitate understanding of the present invention, examples are set forth below. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Examples 1 to 7
The formula composition of the profile control agent is shown in table 1 based on 100 parts of the total weight of the profile control agent.
TABLE 1
In table 1, the sources and preparation methods of the respective raw materials are as follows.
Polyacrylamide: purchased from Toying Bao Mo environmental engineering Co., ltd, with the brand KYPAM1500 and the number average molecular weight of 1500 ten thousand g/mol.
Crosslinking agent containing hydroxyl phenol:
stabilizing agent: m-xylylenediamine available from Shandong Mole chemical Co., ltd, trade name WT70
Water: mineralization degree of 5X 10 4 mg/L。
The preparation method of the profile control agent comprises the following steps:
(1) 4 parts of phenyl acetate, 3 parts of hexamethylenetetramine, 1 part of OP-10 and 0.5 part of ammonium chloride are taken as raw materials, the raw materials are heated to 93 ℃ in a reaction kettle, and high-temperature condensation reaction is carried out under the action of a catalyst to obtain the cross-linking agent, wherein the reaction process is as follows:
(2) Dissolving polyacrylamide in water, mixing a cross-linking agent containing hydroxyl phenol, a stabilizer and water, finally mixing the two solutions, filling into 10 50mL stainless steel aging tanks, standing in a drying oven with a regulated temperature (110 ℃) to obtain the profile control agent, and sampling and observing the viscosity change of 0-180 d.
Examples 8 to 9
Examples 8-9 differ from example 6 in that the temperature of the drying oven was 120 ℃ (example 8) and 130 ℃ (example 9), respectively, the remainder being identical to example 6.
Examples 10 to 11
Examples 10 to 11 differ from example 6 in that the mineralization degree of water was 8X 10, respectively 4 mg/L (example 10) and 1.0X10 5 mg/L (example 11), the remainder being the same as in example 6.
Example 12
This example differs from example 6 in the method of preparation of the crosslinker.
The preparation method of the cross-linking agent comprises the following steps:
taking 4 parts of phenol, 6 parts of hexamethylenetetramine and 0.5 part of ammonium chloride as raw materials, heating to 85 ℃ in a reaction kettle, and carrying out high-temperature condensation reaction under the action of a catalyst to obtain the cross-linking agent
Example 13
The difference between this example and example 6 is that the number average molecular weight of polyacrylamide is 1000 ten thousand g/mol, which is purchased from Toyobao environmental engineering Co., ltd, and the trade name is KYPAM1000, and the rest is the same as in example 6.
Example 14
Example 14 differs from example 6 in that phenyl formate was used in the synthesis of the crosslinking agent, and the remainder was the same as in example 6.
Example 15
Example 15 differs from example 6 in that the stabilizer is m-phenylenediamine and the remainder is the same as in example 6.
Comparative example 1
The comparative example provides a profile control agent, wherein the profile control agent is an organogel profile control agent, and the raw material information is as follows: polyacrylamide is purchased from Toyobao environmental engineering Co., ltd, the trade name is KYPAM1500, the cross-linking agent phenolic resin is purchased from Henan Zhongfan Dongsheng New Material technology Co., ltd, the trade name is PF-3110, and the stabilizer m-phenylenediamine is purchased from Jinan century Tongchemical Co., ltd, the trade name is TP910.
The formula of the raw materials is as follows: 0.4 part by weight of KYPAM,0.3 part by weight of a crosslinking agent, 0.05 part by weight of a stabilizer, and a degree of mineralization of 5X 10 4 mg/L water to 100 parts by weight.
Performance testing
(1) The profile control agents described in examples 1-15 and comparative example 1 were tested as follows:
1) The preparation time is as follows: counting the time for uniformly mixing the profile control agent before canning;
2) Glue forming time: the time for the flooding agent solution to form a stable three-dimensional space network structure; the test method is that the sample in the sample bottle is poured into a beaker, the sample bottle is lifted up to stop pouring in the pouring process, the interruption condition of the sample wire drawing is observed, and the sample is not interrupted in 10 seconds, so that the sample is glued.
3) Viscosity test: the test method is to start measuring viscosity after cooling the sample to be tested to room temperature. Selecting a No. S64 rotor after a Brookfield LVDV III is started, and immersing the rotor into a sample until a groove notch on a rotor rod is formed; selecting a time to stop function in a viscometer "set" option, setting a measurement time to 10s; the viscosity was measured at a rotational speed of 6 r/min.
Viscosity retention: 180d and the ratio of the viscosity to the maximum value of the viscosity during the gelling process.
The test results are summarized in tables 1-2.
TABLE 1
TABLE 2
As can be seen from analysis of the data in tables 1-2, the preparation time of the profile control agent is within 60 minutes, the gel forming time is adjustable and controllable between 12 and 48 hours by adjusting the dosage of each component, and the gel forming time of a conventional phenolic resin crosslinking system in the prior art is less than 10 hours.
In the profile control agent, in the treatment process in the environment of 110-130 ℃, the viscosity of the system gradually rises along with the extension of time, and in the examples 1-11, the retention rate of the viscosity of the system after 180d is more than 86.7%, the gel strength is more than 13000 mPas and the ageing resistance is excellent. In addition, the crosslinking agent and the stabilizer containing the hydroxyl phenol in the profile control agent are less in dosage, so that the profile control agent can be stably applied to high-temperature profile control operation, the accounting cost is 110 yuan/square, and the profile control agent has good economic benefit.
As can be seen from analysis of comparative example 1 and each example, comparative example 1 has a large viscosity change range and poor performance of the system at 120d, and the profile control agent is more beneficial to the high-temperature profile control operation.
Analysis of examples 1 and 6-7 shows that the viscosity of the system increases gradually with increasing polyacrylamide content.
Analysis of examples 6 and 8-9 shows that the maximum viscosity of the system tends to decrease as the process temperature of the oven decreases.
Analysis of examples 6 and 10 to 11 revealed that the viscosity retention rate of the system increased as the degree of mineralization of the system decreased.
As can be seen from the analysis of example 6 and example 12, the performance of example 12 is not as good as that of example 6, and the crosslinking agent prepared by the method of the invention is not only green and environment-friendly, but also is more beneficial to high-temperature flooding operation in the flooding agent.
Analysis of example 6 and example 13 shows that example 13 performs less than example 6, demonstrating that the molecular weight of polyacrylamide forms a profile control agent with better performance in the higher range.
Analysis of example 6 and example 14 shows that example 14 performs less well than example 6, demonstrating that the first reactant, preferably phenyl acetate, forms a crosslinker that is more conducive to enhanced profile control in the formulation of the hydroxyphenyl containing crosslinker.
Analysis of example 6 and example 15 shows that example 15 performs less than example 6, demonstrating that the stabilizer, preferably meta-xylylenediamine, forms a profile control agent that performs better.
(2) A parallel rock core displacement physical model is adopted, a model structure schematic diagram is shown in figure 1, at room temperature, the rock core is vacuumized to obtain the pore volume of the rock core, and the water is driven to saturated oil after the model pressure is stable. The flooding agent (polymer concentration 2000mg/L, crosslinking agent 1000mg/L, stabilizer 500 mg/L) and the flooding agent (polymer concentration 1500mg/L, crosslinking agent 1000mg/L, stabilizer 500 mg/L) described in example 6 were injected respectively, and the mixture was allowed to stand for 48 hours to obtain a water flooding. And (5) inspecting the plugging condition of the profile control front-rear model and the diversion change and recovery ratio improvement condition of the high, medium and low permeable layers.
The test results are summarized in table 3.
TABLE 3 Table 3
The profile control agent disclosed by the invention is used for improving the recovery ratio in a parallel rock core displacement physical model: in the water flooding stage, the recovery ratio of the hypertonic layer is higher. In the injection stage of the profile control agent, the recovery ratio of the medium-low permeability layer is increased. After the follow-up water flooding is finished, the recovery ratio of each small layer of the model is increased to different degrees, the recovery ratio of the middle permeable layer is increased to the maximum, and then the high permeable layer and the low permeable layer are adopted, so that the flooding agent has obvious flooding effect under the parameter condition of the model, and the recovery ratio of each layer, especially the middle permeable layer, can be obviously improved.
(3) The invention relates to a 7 injection 19 production test block of a high 76 fault block deep profile control test of an Jidong oilfield, which is characterized in that the profile control agent is adopted, the total injection amount is designed to be 12.28 square, three slugs are designed to be injected, the front slug is designed to be 1.68 square (the system concentration is 2500 mg/L), the main slug dosage is 10.32 square (the system concentration is 2000 mg/L), and the protection slug dosage is 2800 square (the system concentration is 2500 mg/L). The accumulated oil increment is 12000 tons, and the oil reservoir development effect is obviously improved.
The applicant states that the detailed method of the present invention is illustrated by the above examples, but the present invention is not limited to the detailed method described above, i.e. it does not mean that the present invention must be practiced in dependence upon the detailed method described above. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (10)
1. The profile control agent is characterized by comprising the following components in parts by weight based on 100 parts by weight of the total weight of the profile control agent:
2. the profile control agent according to claim 1, wherein the temperature resistant and salt resistant polymer has a number average molecular weight of > 1000 ten thousand g/mol;
preferably, the temperature-resistant and salt-resistant polymer comprises polyacrylamide and/or a copolymer thereof;
preferably, the mineralization degree of the water is 5×10 4 -1.0×10 5 mg/L。
3. The profile control agent according to claim 1 or 2, characterized in that the structure of the hydroxyphenol-containing cross-linking agent is as follows;
4. a profile control agent according to any one of claims 1 to 3, wherein the preparation of the hydroxyphenol-containing cross-linking agent comprises: a first reactant, a second reactant, an emulsifier, and a catalyst;
the first reactant comprises any one or a combination of at least two of phenyl acetate, phenyl formate or phenyl benzoate;
the second reactant comprises any one or a combination of at least two of hexamethylenetetramine, ethylenediamine or polyoxymethylene.
5. The profile control agent of claim 4, wherein the catalyst comprises any one or a combination of at least two of ammonium chloride, ammonium sulfate, or ammonium bisulfate.
6. The profile control agent according to any one of claims 1 to 5, wherein the stabilizer comprises any one or a combination of at least two of m-xylylenediamine, diethylenetriamine or m-phenylenediamine.
7. A method of preparing a profile control agent according to any one of claims 1 to 6, comprising the steps of:
and dissolving the temperature-resistant and salt-resistant polymer in water, mixing the crosslinking agent containing the hydroxyl phenol, the stabilizer and the water, and finally mixing the two solutions to obtain the profile control agent.
8. The method of preparing the hydroxyl-phenol-containing crosslinking agent according to claim 7, comprising the steps of:
the first reactant and the second reactant are subjected to condensation reaction under the action of a catalyst and an emulsifier to obtain the cross-linking agent;
the first reactant comprises any one or a combination of at least two of phenyl acetate, phenyl formate or phenyl benzoate;
the second reactant comprises any one or a combination of at least two of hexamethylenetetramine, ethylenediamine or polyoxymethylene.
9. The process of claim 8, wherein the temperature of the condensation reaction is from 90 ℃ to 95 ℃.
10. Use of the profile control agent of any one of claims 1-6 in profile control operations;
the temperature of the profile control operation is 110-130 ℃.
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